CN110137644A - A kind of highly selective Wide stop bands balance filter based on the line of rabbet joint - Google Patents
A kind of highly selective Wide stop bands balance filter based on the line of rabbet joint Download PDFInfo
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- CN110137644A CN110137644A CN201910332731.9A CN201910332731A CN110137644A CN 110137644 A CN110137644 A CN 110137644A CN 201910332731 A CN201910332731 A CN 201910332731A CN 110137644 A CN110137644 A CN 110137644A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
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Abstract
The invention belongs to balance filter technical fields, disclose a kind of highly selective Wide stop bands balance filter based on the line of rabbet joint, comprising: the micro-strip set gradually, medium substrate and conductive layer；Passband selecting module and stopband suppression module are formd by etching groove line on conductive layer, passband selecting module includes: two symmetrically arranged open annular resonators in the horizontal direction, signal feed side of the coupled end of one open annular resonator as passband selecting module, the coupled end of another open annular resonator feed out end as the signal of passband selecting module；Stopband suppression module includes: two symmetrically arranged line of rabbet joint pin networks along the vertical direction, and a line of rabbet joint pin network is connect with the signal feed side of passband selecting module, and the signal of another line of rabbet joint pin network and passband selecting module feeds out end connection.The present invention realizes that Wide stop bands and passband are highly selective by using the second order resonance circuit that line of rabbet joint pin network and two line of rabbet joint open annular resonators are constituted respectively.
Description
Technical field
The invention belongs to balance filter technical fields, more particularly, to a kind of highly selective wide resistance based on the line of rabbet joint
Band balance filter.
Background technique
With the high speed development of RF communication system, people are horizontal for the anti-interference ability and noise suppressed of circuit to be wanted
Ask higher and higher.And balancing circuitry makees main effective means to solve this problem and has obtained more concerns and research.Its
In, balance filter is device most basic in balancing circuitry.One competitive balance filter should be able to be effectively
The difference mode signal needed is transmitted, common-mode signal in passband is simultaneously effective inhibited.With highly selective, broad stop-band novel
Balance filter can more preferably meet the needs of communication system, and a trend of research.
In order to obtain high selection characteristic and wide stopband characteristic simultaneously, existing balance filter technology is mainly as follows:
2017, Xin Gao et al. proposed a kind of based on symmetrical/asymmetrical coupling with open circuit or short-circuit minor matters
Cable architecture balance filter.Topic name are as follows: " High-selectivity wideband balanced filters using
Coupled lines with open/shorted stubs ", realizes difference band-pass transmissions characteristic by odd even moding circuit respectively
With broadband common-mode rejection properties.The performance that the balance filter one of proposition is realized is as follows: centre frequency 5GHz, three dB bandwidth 22%,
The stopband of 20dB inhibits can be to 2.9 times of centre frequency.The performance that the balance filter two of proposition is realized is as follows: centre frequency
5GHz, three dB bandwidth 21%, the stopband of 25dB inhibit range can be to 2.9 times of centre frequency.
2018, Marc Sans et al. combined multistage mirror symmetry step impedance resonator and interdigital capacitor to propose tool
There is the balance filter of Wide stop bands.Topic name are as follows: " Compact wideband balanced bandpass filters
With very broad common-mode and differential-mode stopbands ", is also based on micro-
Expected differential transfer and common mode inhibition are realized in the analysis of tape parity mould respectively.The performance that the balance filter of proposition is realized is as follows:
Centre frequency 1.8GHz, three dB bandwidth 55.4%, the center that the stopband of insertion loss 1dB, 22dB inhibit range to be greater than 3.6 times
Frequency.
2017, Lin-Ping Feng et al. was based on line of rabbet joint resonator loaded microstrip minor matters, proposed the flat of stopband enhancing
Weigh filter.Topic name are as follows: " Strip-loaded slotline resonator for compact differential-
Mode bandpass filters with improved upper stopband performance ", since the line of rabbet joint is intrinsic
Full bandwidth in common mode inhibition, design only needs to consider the differential-mode response of circuit.The performance that the balance filter of proposition is realized
As follows: the stopband of centre frequency 3GHz, three dB bandwidth 28%, insertion loss 0.67dB, 20dB inhibit range less than 2.3 times
Centre frequency.
Above mentioned balance filter is all difficult to realize the Gao Xuan that sufficiently wide stopband inhibits range and passband simultaneously
Selecting property.
Summary of the invention
In view of the drawbacks of the prior art, the purpose of the present invention is to provide a kind of, and the highly selective Wide stop bands based on the line of rabbet joint are flat
Weigh filter, it is intended to solve the difference band-pass transmissions that the prior art is realized using micro-strip odd even moding circuit or conventional line of rabbet joint framework
When characteristic and broadband common-mode rejection properties, differential transfer not can be implemented simultaneously in stopband sufficiently wide inhibition range and passband
Highly selective problem.
The present invention provides a kind of highly selective Wide stop bands balance filter based on the line of rabbet joint, comprising: what is set gradually is micro-
Band, medium substrate and conductive layer；Micro-strip is coupled as signal feed with conductive layer, realizes the differential transfer of signal；Conductive layer
Upper to form passband selecting module and stopband suppression module by etching groove line, passband selecting module includes: two along level side
To symmetrically arranged open annular resonator, the coupled end of an open annular resonator is presented as the signal of passband selecting module
Enter end, the coupled end of another open annular resonator feeds out end as the signal of passband selecting module；And signal feed side with
Signal feeds out the central symmetry held about two open annular resonators, constitutes the zero degree feed structure of open annular resonator；
Zero degree feed structure introduces a zero point in passband two sides respectively, for enhancing the selection characteristic of passband；Stopband suppression module packet
Include: two symmetrically arranged line of rabbet joint pin networks along the vertical direction inhibit for the wide frequency ranges to high-frequency harmonic, real
The stopband for having showed ultra-wide inhibits；One line of rabbet joint pin network is connect with the signal feed side of passband selecting module, another line of rabbet joint π
Type network and the signal of passband selecting module feed out end connection.
Further, the structure of each open annular resonator is identical, includes: annular line of rabbet joint 5b, the first coupling slot
Line 6b, the second coupling line of rabbet joint 7b, the first load line of rabbet joint 8b and the second load line of rabbet joint 9b；One end of annular line of rabbet joint 5b is coupled with first
One end of line of rabbet joint 6b connects, and the other end of annular line of rabbet joint 5b is connect with one end of the second coupling line of rabbet joint 7b, the first coupling line of rabbet joint 6b
The other end with first load line of rabbet joint 8b one end connect, second coupling line of rabbet joint 7b the other end and second loads line of rabbet joint 9b one
The other end of end connection, the other end of the first load line of rabbet joint 8b and the second load line of rabbet joint 9b do not connect mutually with annular line of rabbet joint 5b
It is logical.
Further, the first coupling line of rabbet joint 6b and the first load line of rabbet joint 8b is vertically arranged, second coupling slot
Line 7b is vertically arranged with the second load line of rabbet joint 9b.The line of the coupling line of rabbet joint so better than in tuning open annular resonator
Wide and wire length, and then the characteristics such as bandwidth for tuning passband.
Further, the first coupling line of rabbet joint 6b and the second coupling line of rabbet joint 7b be along horizontally arranged,
Horizontal direction realizes uniformly coupling.And signal feed-in may be implemented, the passband low-loss that signal is fed out.
Further, line width of the line width of the first load line of rabbet joint 8b less than the first coupling line of rabbet joint 6b.Broader coupling slot
Line can realize stronger signal coupling under the conditions of not increasing coupling slot line length.
The line width of first coupling line of rabbet joint 6b is less than the line width of annular line of rabbet joint 5b；By selecting the wider annular line of rabbet joint, can wait
The annular line of rabbet joint for imitating out larger radius, is equivalent to the radius for reducing the annular line of rabbet joint, effectively reduces the area of the line of rabbet joint.
In embodiments of the present invention, stopband suppression module is used to inhibit the wide frequency ranges of the harmonic wave of high frequency, while its
Pass-band performance is not influenced substantially.Stopband suppression module includes two symmetrically arranged line of rabbet joint pin networks along the vertical direction,
In one connect with the feed side of passband selecting module, another and passband selecting module feed out end connection.
Further, each line of rabbet joint pin network structure is identical, includes: connection line of rabbet joint 1b, the first input coupling line of rabbet joint
2b, the second input coupling line of rabbet joint 3b and third input coupling line of rabbet joint 4b；Connection line of rabbet joint 1b is arranged along the vertical direction, and third inputs coupling
The one end for closing line of rabbet joint 4b is connected with the center for connecting line of rabbet joint 1b, and the other end and passband of third input coupling line of rabbet joint 4b selects
The feed side of module connects；One end of first input coupling line of rabbet joint 2b and one end of the second input coupling line of rabbet joint 3b are and link slot
Line 1b is connected, and central symmetry of the link position about connection line of rabbet joint 1b.
Further, the first input coupling line of rabbet joint 2b, the second input coupling line of rabbet joint 3b and the third input coupling
Line of rabbet joint 4b is closed each along horizontally arranged, and respectively with connect line of rabbet joint 1b and be vertically arranged.It can guarantee pair of differential transfer
While title property, simplify the complexity of design.Line of rabbet joint 1b is connected simultaneously using longitudinal etching, and the lateral line of rabbet joint relative to routine is short
Road minor matters effectively reduce the area of circuit, and then reduce radiation loss, it helps the connection of pin network.
In embodiments of the present invention, the first input coupling line of rabbet joint 2b, the second input coupling line of rabbet joint 3b must select enough lines
Wide and wire length, so as to effectively improve stopband inhibitory effect.Its width is generally higher than the width of the third coupling line of rabbet joint, length
On should meet can be microstrip coupled and be not connected to the annular line of rabbet joint with the first matching.If line width selection is improper, stopband inhibits model
Enclosing can critical constraints.
Further, the length of the first input coupling line of rabbet joint 2b and the length of the second input coupling line of rabbet joint 3b meet
It can match microstrip coupled with first and be not connected to the annular line of rabbet joint.
Preferably, line width of the line width of third input coupling line of rabbet joint 4b less than the first input coupling line of rabbet joint 2b, third input
Couple line width of the line width less than the second coupling line of rabbet joint 3b of line of rabbet joint 4b.In general, it should use small line width, realize smaller
Score line feature impedance meets the impedance matching relationship in microstrip-slot line conversion, realizes that signal preferably transmits.
Used above technical scheme through the invention, compared with prior art, can obtain it is following the utility model has the advantages that
(1) present invention constitutes second order resonance circuit by using two line of rabbet joint open annular resonators.Its feed structure class
Framework is fed like zero degree in micro-strip, so that passband two sides additionally obtain a transmission zero respectively, to effectively enhance logical
The selection characteristic of band.
(2) π type groove gauze network proposed by the present invention is by the way that with top layer micro-strip multiple coupling, the connection relative to routine is short-circuit
Line of rabbet joint minor matters efficiently reduce the area of circuit, and then reduce the loss in passband.Most of all, it greatly changes
Stopband has been apt to it and has inhibited range, the stopband for realizing ultra-wide inhibits.
In addition, changing the Differential Input micro-strip of the balance filter of proposition into single ended input micro-strip, that is, remove the second input
Micro-strip, while the first input coupling line of rabbet joint of corresponding removal and the second input coupling line of rabbet joint, the present invention can also be extended to high selection
On property Wide stop bands balun filter.It, equally can be real using the line of rabbet joint open annular resonator and π type groove lines matching circuit of proposition
The Wide stop bands outside highly selective and passband in existing passband.Due to line of rabbet joint reverse phase electric field transmission characteristic, the balun of realization has excellent
Different output equilibrium response.
Detailed description of the invention
Fig. 1 is the highly selective Wide stop bands balance filter system architecture block diagram of the present invention；
Fig. 2 is the cross-sectional view of the highly selective Wide stop bands balance filter of the present invention；
Fig. 3 is the highly selective Wide stop bands balance filter planar structure schematic diagram of the present invention；
Fig. 4 is the highly selective Wide stop bands balance filter frequency response curve of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention provides a kind of highly selective Wide stop bands balance filters, while realizing the highly selective and logical of passband
Wide inhibition range with outer stopband, and filter has low insertion loss and compact circuit size.
Fig. 1 is the block architecture diagram of highly selective Wide stop bands balance filter proposed by the invention.Wherein, π type groove gauze
Network (stopband suppression module) is used to realize that Wide stop bands, the open annular resonator (passband selecting module) of use are used to realize Gao Xuan
Selecting property.
Fig. 2 is the cross-sectional view of balance filter proposed by the present invention, and 1 indicates top layer micro-strip metal, and 2 indicate that substrate is situated between
Matter, 3 indicate bottom conductive metal.
Highly selective Wide stop bands balance filter provided by the invention, comprising: the micro-strip 1 set gradually, medium substrate 2 with
And conductive layer 3；Wherein, the line of rabbet joint in the conductive layer 3 is special transmission line of the etching in bottom.It is transmitted since the line of rabbet joint motivates
When, have reversed electric field towards characteristic, when 1 Differential Input of micro-strip, line of rabbet joint reverse transfer electric field coupled thereto in conductive layer 3
Mode can just be motivated, to realize effective transmission of differential signal.And when the input of 1 common mode of micro-strip, the line of rabbet joint coupled thereto
Two sides are motivated by identical direction of an electric field signal, are not able to satisfy line of rabbet joint electric field reverse transfer mode, to have natural common mode
Rejection characteristic；Passband selecting module and stopband suppression module are formd by etching groove line on the conductive layer.
Fig. 3 is the specific planar structure schematic diagram of balance filter proposed by the present invention.The P1 and P1 ' indicates two
Differential Input port, P2 and P2 ' indicate two difference output ports.
Micro-strip 1 is used as signal feed, couples with conductive layer, realizes the differential transfer of signal；Micro-strip 1 includes: along vertical
The symmetrically arranged input micro-strip in direction and output micro-strip, input micro-strip and a line of rabbet joint pin network layer in stopband suppression module
Between couple, output micro-strip and stopband suppression module in another line of rabbet joint pin network layer coupling.
It inputs micro-strip and the output structure of micro-strip is identical, input micro-strip includes: that first set gradually inputs micro-strip 1a, the
One matching micro-strip 2a and the second input micro-strip 3a；The line width of first input micro-strip 1a is identical as the second input line width of micro-strip 3a,
Its 50 ohm characteristic impedance for corresponding to micro-strip；The line width of first matching micro-strip 2a is greater than the line width of the first input micro-strip 1a,
Corresponding micro-strip characteristic impedance is less than 50 ohm, for realizing optimal micro-strip and the impedance matching of line of rabbet joint input coupling.
Output micro-strip includes: the first output micro-strip 4a, the second matching micro-strip 5a and the second output micro-strip 6a set gradually；
The line width of first output micro-strip 4a is identical as the second output line width of micro-strip 6a, corresponds to 50 ohm characteristic impedances of micro-strip；
The line width of second matching micro-strip 5a is greater than the line width of the first output micro-strip 4a, corresponds to micro-strip characteristic impedance less than 50 ohm, uses
To realize optimal micro-strip and the impedance matching of line of rabbet joint output coupling.
Wherein, the first input micro-strip 1a and the second input micro-strip 3a, the first output micro-strip 4a and the second output micro-strip 6a, the
One matching micro-strip 2a and the second matching micro-strip 5a constitute top layer micro-strip 1.First, second input and output micro-strip is all that characteristic impedance is
50 ohm of line width is used to realize the input and output of differential signal.First, second matching micro-strip line width is more micro- than input and output
Band line width is wider, has smaller characteristic impedance, couples with the line of rabbet joint and better impedance transformation matching may be implemented.Top layer micro-strip
1 is horizontally and vertically symmetrical about the plane of symmetry, for meeting the symmetry characteristic of input and output differential transfer.
In embodiments of the present invention, passband selecting module is used for passband central frequency, pass band width, passband squareness factor
The determination of pass-band performances such as (parameters of quantization passband selectivity)；Passband selecting module is constituted using two open annular resonators
Second order resonance circuit.Specifically, passband selecting module includes: two symmetrically arranged open annular resonators in the horizontal direction,
Signal feed side of the coupled end of one of open annular resonator as passband selecting module, another open annular resonance
The coupled end of device feeds out end as the signal of passband selecting module；Its feed-in feeds out the center about two open annular resonators
Symmetrically, the zero degree feed structure of open annular resonator is constituted；The structure can introduce additional one in passband two sides respectively
A zero point enhances the selection characteristic of passband.
The structure of each open annular resonator is identical, includes: annular line of rabbet joint 5b, the first coupling line of rabbet joint 6b, the second coupling
Close line of rabbet joint 7b, the first load line of rabbet joint 8b and the second load line of rabbet joint 9b；One end of annular line of rabbet joint 5b couples the one of line of rabbet joint 6b with first
End connection, the other end of annular line of rabbet joint 5b with second coupling line of rabbet joint 7b one end connect, first couple line of rabbet joint 6b the other end and
One end connection of first load line of rabbet joint 8b, the other end of the second coupling line of rabbet joint 7b are connect with one end of the second load line of rabbet joint 9b, the
The other end of the other end of one load line of rabbet joint 8b and the second load line of rabbet joint 9b are not connected to mutually with annular line of rabbet joint 5b.
Two zero points that line of rabbet joint zero degree feed introduces are associated with two branches of open annular resonator.Branch one: by
First coupling line of rabbet joint 6b and the first load line of rabbet joint 8b are constituted；Branch two: by annular line of rabbet joint 5b, the second coupling line of rabbet joint 7b and second adds
Line of rabbet joint 9b is carried to constitute.The electrical length of every branch meets 90 ° of electrical length, will generate a zero point in corresponding frequencies.Wherein, it props up
Road one determines that dead-center position on the right side of passband, branch two determine dead-center position on the left of passband.Tuning two branches, passband have
Flexible controllability.
Preferably, the first coupling line of rabbet joint 6b and the second coupling line of rabbet joint 7b are realized in the horizontal direction along horizontally arranged
Uniformly coupling.And it, which uses to be horizontally disposed with, may be implemented the passband low-loss that signal feed-in is fed out.
Stopband suppression module includes two symmetrically arranged line of rabbet joint pin networks along the vertical direction, one of them is selected with passband
The feed side connection of module is selected, another feeds out end connection with passband selecting module.Each line of rabbet joint pin network structure is identical,
It include: to connect line of rabbet joint 1b, the first input coupling line of rabbet joint 2b, the second input coupling line of rabbet joint 3b and third input coupling line of rabbet joint 4b,
Connection line of rabbet joint 1b is arranged along the vertical direction, and one end of third input coupling line of rabbet joint 4b is connected with the center for connecting line of rabbet joint 1b,
The other end of third input coupling line of rabbet joint 4b is connect with the feed side of passband selecting module；One end of first input coupling line of rabbet joint 2b
With one end of the second input coupling line of rabbet joint 3b with connect line of rabbet joint 1b and be connected, and center pair of the link position about connection line of rabbet joint 1b
Claim.
Preferably, the first input coupling line of rabbet joint 2b, the second input coupling line of rabbet joint 3b and the equal edge third input coupling line of rabbet joint 4b
It is horizontally arranged, and respectively with connect line of rabbet joint 1b and be vertically arranged；While it can guarantee the symmetry of differential transfer, letter
Change the complexity of design.Line of rabbet joint 1b is connected simultaneously using vertical etching, is effectively subtracted relative to conventional horizontal slot line short circuit minor matters
The small area of circuit, and then reduce radiation loss, it helps the connection of pin network.
π type groove gauze network is greatly changed by the multiple coupling between micro-strip 1 relative to conventional line of rabbet joint short circuit minor matters
It has been apt to the inhibition of its stopband.Conventional line of rabbet joint short circuit minor matters 20dB stopband inhibits generally be suppressed to 2 to 3 times of centre frequency
The stopband of 20dB can be inhibited range to be promoted to more than 7 times of centre frequencies by place, pin network proposed by the present invention.
Preferably, the first input coupling line of rabbet joint 2b, the second input coupling line of rabbet joint 3b must select enough line widths and wire length, from
And it can effectively improve stopband inhibitory effect.Its width is generally higher than the width of the third coupling line of rabbet joint, should meet in length
It can match microstrip coupled with first and be not connected to the annular line of rabbet joint.If line width selection it is improper, stopband inhibit range can seriously by
Limit.
Preferably, the line width of third input coupling line of rabbet joint 4b is less than the coupling line of rabbet joint of the first input coupling line of rabbet joint 2b and second
3b.In general, it should use small line width, smaller score line feature impedance is realized, meet the impedance in microstrip-slot line conversion
Matching relationship realizes that signal preferably transmits.
For the verifying present invention, the dielectric constant of first medium substrate is 3.66, with a thickness of 0.762 millimeter, loss angle tangent
It is 0.004, thick 0.035 millimeter of the Rogers 4350B of copper.
Fig. 4 illustrates the S parameter emulation and test result of the above-mentioned highly selective Wide stop bands balance filter of the present invention.For
The differential-mode response of balance filter, the bandwidth of the 3dB of test are 2.47GHz-4.35GHz (relative bandwidth 55.1%), and passband
Interior return loss is greater than 20dB.The corresponding insertion loss of passband central frequency 3.5GHz is 1.07dB.Also, with 20dB
Stopband inhibition can at least arrive 25GHz.The 20dB bandwidth of passband is 1.34 than the squareness factor of three dB bandwidth.To with balancing filter
The common-mode response of device, the test common mode inhibition in passband are greater than 40.5dB.Compared with prior art, balance filter proposed by the present invention
There is wave device broader stopband range and excellent passband to be inhibited to select characteristic, while ensure that compact circuit size, undershoot
Enter loss and there is emulative passband common mode inhibition.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (9)
1. a kind of highly selective Wide stop bands balance filter based on the line of rabbet joint characterized by comprising the micro-strip set gradually
(1), medium substrate (2) and conductive layer (3)；
The micro-strip (1) couples as signal feed with the conductive layer (3), realizes the differential transfer of signal；
Passband selecting module and stopband suppression module, the passband selection are formd by etching groove line on the conductive layer (3)
Module includes: two symmetrically arranged open annular resonators in the horizontal direction, and the coupled end of an open annular resonator is made
For the signal feed side of passband selecting module, signal of the coupled end of another open annular resonator as passband selecting module
Feed out end；And the signal feed side and the signal feed out the zero degree feed structure that end constitutes open annular resonator, it is described
Zero degree feed structure introduces a zero point in passband two sides respectively, for enhancing the selection characteristic of passband；
The stopband suppression module includes: two symmetrically arranged line of rabbet joint pin networks along the vertical direction, for high-frequency harmonic
Wide frequency ranges are inhibited；One line of rabbet joint pin network is connect with the signal feed side of passband selecting module, another line of rabbet joint π
Type network and the signal of passband selecting module feed out end connection.
2. highly selective Wide stop bands balance filter as described in claim 1, which is characterized in that each open annular resonator
Structure it is identical, include: annular line of rabbet joint 5b, the first coupling line of rabbet joint 6b, the second coupling line of rabbet joint 7b, the first load line of rabbet joint 8b and the
Two load line of rabbet joint 9b；
One end of annular line of rabbet joint 5b is connect with one end of the first coupling line of rabbet joint 6b, the other end and the second coupling slot of annular line of rabbet joint 5b
One end of line 7b connects, and the other end of the first coupling line of rabbet joint 6b is connect with one end of the first load line of rabbet joint 8b, the second coupling line of rabbet joint
The other end of 7b is connect with one end of the second load line of rabbet joint 9b, the other end of the first load line of rabbet joint 8b and the second load line of rabbet joint 9b
The other end be not connected to mutually with annular line of rabbet joint 5b.
3. highly selective Wide stop bands balance filter as claimed in claim 2, which is characterized in that the first coupling line of rabbet joint 6b
It is vertically arranged with the first load line of rabbet joint 8b, the second coupling line of rabbet joint 7b is vertically arranged with the second load line of rabbet joint 9b.
4. highly selective Wide stop bands balance filter as claimed in claim 2 or claim 3, which is characterized in that first coupling slot
The line 6b and second coupling line of rabbet joint 7b is along horizontally arranged, realization uniformly coupling in the horizontal direction.
5. such as the described in any item highly selective Wide stop bands balance filters of claim 2-4, which is characterized in that described first adds
The line width for carrying line of rabbet joint 8b is less than the line width of the first coupling line of rabbet joint 6b；The line width of the first coupling line of rabbet joint 6b is less than the ring
The line width of shape line of rabbet joint 5b.
6. highly selective Wide stop bands balance filter as described in any one in claim 1-5, which is characterized in that each line of rabbet joint π
Type network structure is identical, includes: connection line of rabbet joint 1b, the first input coupling line of rabbet joint 2b, the second input coupling line of rabbet joint 3b and third
Input coupling line of rabbet joint 4b；
Connection line of rabbet joint 1b is arranged along the vertical direction, and one end of third input coupling line of rabbet joint 4b connects with the center for connecting line of rabbet joint 1b
It connects, the other end of third input coupling line of rabbet joint 4b is connect with the feed side of passband selecting module；First input coupling line of rabbet joint 2b's
One end and one end of the second input coupling line of rabbet joint 3b with connect line of rabbet joint 1b and be connected, and link position is about in connection line of rabbet joint 1b
The heart is symmetrical.
7. highly selective Wide stop bands balance filter as claimed in claim 6, which is characterized in that the first input coupling slot
Line 2b, the second input coupling line of rabbet joint 3b and the third input coupling line of rabbet joint 4b are each along horizontally arranged, and respectively
It is vertically arranged with line of rabbet joint 1b is connect.
8. highly selective Wide stop bands balance filter as claimed in claims 6 or 7, which is characterized in that third input coupling slot
Line width of the line width of line 4b less than the first input coupling line of rabbet joint 2b, the line width of third input coupling line of rabbet joint 4b is less than the second coupling slot
The line width of line 3b.
9. such as the described in any item highly selective Wide stop bands balance filters of claim 6-8, which is characterized in that described first is defeated
Enter to couple line of rabbet joint 2b length and the second input coupling line of rabbet joint 3b length meet can with first matching micro-strip 2a couple and
It is not connected to the annular line of rabbet joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910332731.9A CN110137644B (en) | 2019-04-23 | 2019-04-23 | High-selectivity wide-stop-band balance filter based on slot line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910332731.9A CN110137644B (en) | 2019-04-23 | 2019-04-23 | High-selectivity wide-stop-band balance filter based on slot line |
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| CN110137644A true CN110137644A (en) | 2019-08-16 |
| CN110137644B CN110137644B (en) | 2020-10-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114696068A (en) * | 2020-12-25 | 2022-07-01 | 中国科学院沈阳自动化研究所 | Multi-band antenna integrated device for underwater vehicle and data acquisition method thereof |
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